HomeMy WebLinkAboutSpecial Report (052)
Roger Brown
Buffer Revegetation Plan
Parcel # 801 034 015
May 2004
Contents
Project Overview
Revegetation Approach
Buffer Reduction
Monitoring Plan
Vegetation Monitoring
Photo-documentation
Reporting Schedule
Installation, Maintenance, and Monitoring Schedule
Performance Standards
Contingency Plan
Summary
Appendix
Sheet #1. Buffer Enhancement Plan
Table #1. Wetland Plant List and Landscape Specifications
Table #2. Re-seeding Recommendations apd Quantities
Installation Specifications and Recommendations
Sample Monitoring Form
JUN - 1 2004
Roger Brown
Buffer Revegetation Plan
Parcel # 801 034 015
May 2004
\\
JUN - 1 2004
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Project Overview
A Level I wetland assessment was conducted by Olympic Wetland Resources, Inc. on April 15,
2004 at the request of Roger Brown to determine the impact of backfilling within a critical
wetland area. A wetland and Type 5 stream ravine have been backfilled with soils (at least seven
hundred cubic yards) originating from the excavation for a home site. This wetland, in its natural
state, was connected to a larger hydrologic system that eventually drains into Chimacum Creek, a
creek known to contain the threatened Summer Chum Salmon. Although this wetland is highly
impacted by imported fill and numerous buildings on the adjacent property (Mr. Schmidt to the
north) it will classify as a Class II wetland due to diversity of remaining vegetation, size, and
proximity to critical habitats. Class II wetlands are assigned 100 foot buffers; the buffers at this
site no longer protect the function and values of this wetland system.
The exposed soils within the mound measure 70 linear feet. Approximately 7,000 square feet of
the 1 DO-foot buffer has been impacted. This revegetation plan is designed to mitigate this
impacted area after the final grading is complete. This report is prepared in conjunction with a
Stormwater Plan (Tillman Engineering) and an on-site septic design (Mike Deeny, Creative
Design Solutions). -
Revegetation Approach
The primary goal of this revegetation plan is to mitigate buffer impacts (7,000 square feet) and to
restore buffer functions by planting native trees and shrubs known to thrive in east Jefferson
County. The species were chosen in accordance with soil types and water tolerance. Over time,
as vegetation becomes established, buffers will provide shading, input of organic debris, and
diverse structural layers for wildlife.
Secondary goals include increasing species diversity, thereby increasing habitat value for
wildlife. The planting plan includes spruce, Douglas firs, cedars, vine maple, hazelnut,
twinberry, red-flowering currant, and dogwood. To mitigate the 7,000 square feet of impacts,
over 50 trees (spaced at 10 feet apart) and 40 shrubs (spaced at 4 to 5 feet apart) will be installed.
Prior to any planting, all metal debris, tires, and foreign material will be removed from within
100 feet of the wetland edge. Slope angles should be reduced, slopes stabilized, the landform
Brown Buffer Revegetation Plan
May 2004
Olympic Wetland Resources, Inc.
J U N -. 1 2004
returned to natural contours, and storm water drainage patterns re-defined. Stormwater
discharges should be directed to the wetland though drainage swales to maintain hydrology in the
wetland. Since it is impossible to determine conditions prior to the fill the wetland edge is now
defined as the toe of the slope where the imported soils meet the wetland (marked by the
presence of skunk cabbage and horse tails). The site to be revegetated is located upslope to the
west, 100 feet from the wetland edge,
All existing native vegetation found on site should be protected during the re-grading and
revegetation process, Species identified on site include alders, cedars, spruce, Douglas fir,
spirea, salmonberry, Indian plum, skunk cabbage, water parsley, and horsetail. Invasive species
such as Himalayan blackberry and Scot's broom will be controlled and removed from the newly
planted buffer.
The planting plan is included in the Appendix (Buffer Revegetation Plan, Sheet # 1). The
revegetation site is divided into two zones, Zone 1 in near the wetland and includes species that
can tolerate wetland conditions. Zone 2 is upslope; species to be planted here are adapted to
dryer conditions, Complete landscape specifications are listed including quantities, sizes,
optimum locations, zones, and spacing for each plant and all remaining bare areas should be re-
seeded with the seed mix included in the Appendix (Table #1 and Table #2). Plantings can be
rearranged to suit landscape and aesthetic choices as long as the species are within the general
zones as shown.
The Appendix also includes a directory oflocal nurseries that supply native plants and
installation specifications and recommendations, It is critical for the success of any newly
planted trees and shrubs to be maintained for the first two to three years. Maintenance includes
watering and weeding and replacement of plant material that does not survive after the initial
planting.
Buffer Reduction
In order to accommodate a feasible site for the septic system and drainfield a reduction of the
standard 100-foot buffer will be required near the site of the old bus. The Health Department and
Department of Community Development may authorize a buffer reduction (Jefferson County
Unified Development Code Section 3.6.9 (6) on a case-by-case basis. The proposed residence is
outside all buffers; only the drain field will be included within the buffer.
Monitoring Plan
A professional wetland biologist will conduct site monitoring. Jefferson County Development
Review Division will evaluate success rates of the planted species annually for five years. At
that point it will be determined whether monitoring will be required beyond the five-year period.
Monitoring will be conducted in June or July to correspond to the growing season,
Vegetation Monitoring
Monitoring data sheets have been developed for recording plant survivorship, density, and
general condition of planted species. A sample Monitoring Form is included in the Appendix.
Mortality of vegetation will be documented along the newly planted buffer and percent ground
Brown Buffer Revegetation Plan
May 2004
2
Olympic Wetland Resources, Inc.
II;
JUN - 1 2004
cover will be recorded. All volunteer species including the non-native invasive species will be
noted. Data gathered using the monitoring form will be used to evaluate overall success rates
and to determine whether performance standards are met (see Performance Standards below).
Post-construction monitoring will be conducted during the mid-growing season to evaluate the
condition of the plantings. Monitoring of vegetation will begin one year following plant
installation and wtll continue for five years. All dead or dying plant material will be replaced
after the second year with the same species from the original planting plan.
Photo-documentation
Photographic monitoring provides a visual record of the restoration effort and is an excellent way
to qualitatively document plant community changes. Permanent photo-point stations will be
established and labeled in the restoration area. Photo-point photographs will be taken during,the
monitoring process by the wetland biologist and included in the annual report.
Reporting Schedule
Summary reports will be prepared following annual monitoring and submitted to the Jefferson
County Development Review Division within one month of fieldwork. A weed control plan to
remove invasive plants will be included in the monitoring report, Information will also be
available upon request during the year. The installation, maintenance and monitoring schedule is
presented below.
Installation, Maintenance, and Monitoring Schedule
This table is to be submitted with monitoring report; white areas in table to be filled in with
com letion dates.
Planting
Maintenance*
Irrigation **
Replace plants(as needed)
I Photo-point
MonitOring Report
*Maintenance: May through September
** Irrigation: August through October
Performance Standards
The proposed length of time for mitigation compliance is five years, This time period will allow
for the planted and volunteer species to become established in the planted area, Survivorship
will be determined during the monitoring process; the project will be considered successful if,
after three years, over 80% of the trees and shrubs are healthy and vigorous. Weedy species
should comprise not more than 10% of the ground cover.
Brown Buffer Revegetation Plan
May 2004
3
Olympic Wetland Resources, Inc.
Contingency Plan
The purpose of the contingency plan is to discuss alternatives to the re-vegetation project if
environmental goals are not successfully met. Recommendations may include replanting of dead
or dying material, or increasing maintenance or watering, Deer browsing may be a problem with
young vegetation ~nd some plants may require protective barriers. A contingency plan will be
submitted with the first year monitoring report if needed,
Summary
This revegetation plan addresses the impacts from the placement of excavated fill within a .
wetland and stream ravine, The large mound of soil placed within the Class II wetland buffer
will be fe-contoured and revegetated with appropriate native trees and shrubs. Over 7,000 square
feet of buffer will be enhanced in an effort to mitigate impacts. In concert with the storm water
plan (Tillnian Engineering) and septic site location (Mike Deany, Creative Design Solution) this
revegetation plan will complete requirements needed for the building of a single-family residence
for Roger Brown.
Compliance with the initial stormwater, grading, and revegetation plan will be verified through
inspections during and after construction by Jefferson County Department of Community
Development. The success of the revegetation plan will be dependent upon ongoing
maintenance. Success rates will be evaluated over the next 5 years through the monitoring
process by a professional wetland biologist. Final approval of this revegetation project falls
under the jurisdiction of Jefferson County Department of Community Development, Critical
Areas Division.
If you have any questions or would like to discuss further aspects of this project, please feel free
to call.
JUN .- 1 .2004
Dixie Llewellin, Principal Biologist
Olympic Wetland Resources, Inc.
Certified for Wetland Delineation, 1987 Manual
Wetland Training Institute, June 1995
If
Brown Buffer Enhancement Plan
March 2004
4
Olympic Wetland Resources, Jnc
Appendix
Sheet #1. Buffer Enhancement Plan
Table #1. Wetland Plant List and Landscape Specifications
Table #2. Re-seeding Recommendations and Quantities
Installation Specifications and Recommendations
Sample Monitoring Form
II
JUN ~ 1 2004
.4;'
~Wf Gl Olyrnpi( Werland Resourtes, In(
Title:
Buffer Revegetation Plan
Parcel #801 034015
Stole:
/J.s Indicated
Sheet
856 50th Street
Port Townsend, WA 98368
360 385-6432
, dixie@ooblespeed,(om
I
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ctlent:
Roger Brown
P,O. Box 1043
Port Hadlock, Wa
May 2004
#1
Job#:
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Installation Specifications and Recommendations
All areas of exposed soil will be revegetated with species known to tolerate local soils
and conditions, Individual plant species have be~n selected because they have a high
habitat value, are consistent with surrounding vegetation, and are known to thrive in east
Jefferson County.
Fall Installation
Planting should be installed between mid-September and mid-November, unless the new
plantings can be watered throughout the summer. Plantings instalied in the fall generally
outperform those installed in the late winter or spring. Plants put in the ground in the fall'
have the advantage of an extended period for root growth before rapid top growth in the
spring. In the fall, the soil is warmer and more aerated than in the spring and most plants
experience active root growth during this time~
The cool, cloudy days and frequent precipitation of fall and winter also provide ideal
transplanting conditions. Until sufficient root systems develop, newly installed plants will
undergo transplanting stress that can be exacerbated by hot sunny days. Fall and winter
weather allows for reduced transpiration and provides ample moisture for the roots while
the plant recovers from transplant shock.
Root Disturbance
Immediately before installation plants with broken, damaged, or twisted roots
must be pruned. Matted or circling roots of containerized plantings must be
pruned or straightened and the sides of the root ball must be roughened from top
to bottom to a depth of approximately half an inch in'two to four places.
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If circling roots are left, they.may eventually girdle the plant as they grow and
thicken in place. If the roots at the edge of the root ball are straightened and
extended, they will have access to a greater volume of soil in the planting hole.
Also, the roughened edges of the root ball will have better contact with the
backfill soil.
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Disturbing and removing one-fourth to one-half of the roots in the outer inch of
the root ball will damage only the most sensitive plants; most often, this treatment
actually stimulates increased plant growth. .
Plant Depth
The finished height of each plant's root ball will be slightly higher than that of the
surrounding soil. The exception is for sandy soils, in which case the soil heights
will be even. The top of the root ball will not be covered with backfill soil. A
watering basin will be formed around each planting by building a berm of soil at
least 30 inches in diameter.
1
When planting a container-grown plant, the top of the root ball should not be
covered with any other soil. Covering the root ball with soil, particularly if it has a
finer texture than the potting or field-growing soil, will generally cause water to
flow around the root ball instead of into it; root balls covered in this way may
receive water Qnly from below. To allow direct wetting of the root ball from
above, install the plant so that the top of the nursery soil is slightly higher than the
surrounding soil level. If the soil is sandy, or ofa large particle size, then the
nursery soil should be level with the surrounding soil.
A watering basin made of mounded soil around each planting will further help to
catch water from above-the berm should be at least 30 inches in diameter
surrounding a plant. Mulch placed within the basin and on the berm will limit
moisture loss from the root ball and surrounding soil, but take care that it does not
come into contact with the stem of the plant as rodents or pathogens living in the
mulch may attack the bark.
Re-seeding
After the completion of the construction and planting projects, a seed mix (included in
Table 1.) will be evenly spread on all bare areas. An inspection by a wetland biologist or
Critical Areas staff of Jefferson County Department of Community Development will be
required after all planting is completed,
Maintenance: Weeding and Irrigation
The use of appropriate native species and careful planting ensures that the need for
ongoing maintenance will be minimized. However, some maintenance is required to
ensure that the young plants become established. It is recommended that weeding around
new plants be conducted once or twice a year during the months of May and September
for the first five years, and as often as needed after that. All Scot's broom, Himalayan
blackberry, and thistle should _be monitored and eliminated from the site.
Irrigation may be required for upland species (vine maple, red-flowering currant, and
pine) for the first three years or until plants are well established. Hand watering or
irrigating with overhead sprinklers once a week should be adequate during the hot
summer months. Wetland species that are planted near the creek corridor may require
less watering.
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